CARDUACEAE. 389 



6. Arnica foliosa Nutt. In valleys from Mont, to Colo. — Alt. 8000-10,000 

 ft. — Silverton; alkali meadow, Higho; Sargent; Parlin. 



7. Arnica celsa A. Nels. In valleys from Wyo. to Colo. — Estes Park, Lari- 

 mer Co. ; lola ; Grizzly Creek. 



8. Arnica macilenta Greene. In valleys of Wyo. and Colo. — Alt. about 8000 

 ft. — Steamboat Springs; Andrews' Shetland ranch. 



g. Arnica Rydbergii Greene. On hills from Mont, to Colo. — Alt. 8000-12,000 

 ft. — Lula Pass, Larimer Co. ; Silver Plume ; Cameron Pass ; Eldora to Bal- 

 timore; Hahn's Peak; summit of North Park Range. 



10. Arnica tenuis Rydb. In the mountains of Colo, and Wyo. — Alt. gooo- 

 12,000 ft. — Beaver Creek. 



11. Arnica coloradensis Rydb. In the mountains of Colo. — Exact locality 

 not given. 



12. Arnica subplumosa Greene. (A. Chamissonis longinodosa A. Nels.) 

 In meadows from Mont, to Colo. — Alt. 10,000-12,000 ft. — Mountains above 

 Ouray; Marshall Pass; mountains east of North Park; Silver Plume; Breck- 

 enridge; Mt. Harvard; Berthoud Pass; Bufifalo Pass; Chambers' Lake; 

 Gray's Peak; Fish Creek Falls. 



13. Arnica longifolia D. C. Eaton. (A. polycephala A. Nels.) In meadows 

 from Mont, and Wash, to Colo, and Calif. — Alt. 10,000 ft. — Keblar Pass; 

 Ethel Peak. 



14. Arnica fulgens Pursh. On hills from S. D., Alb. and B. C. to Colo, 

 and Calif. — Alt. 8500 ft. — Empire; Pinkham Creek. 



15. Arnica pedunculata Rydb. On hills from N. D. and Wash, to Colo, 

 and Calif. — Alt. 6000-10,000 ft. — Vicinity of Como; Clear Creek; Estes Park; 

 Horsetooth Gulch ; foot-hills, Larimer Co. ; gulch south of Boulder ; Table 

 Rock; Dixon Cafion; Rist Cafion. 



16. Arnica monocephala Rydb.. On hills from Mont, and Ida. to Colo. — 

 Alt. 6000-12,000 ft. — Dale Creek, Larimer Co. ; Horsetooth Mountain ; Bert- 

 houd Pass. 



17. Arnica Parryi A. Gray. <^A. eradiata (A. Gray) Heller) In the 

 mountains from Mont, and B. C. to Colo, and Wash. — Alt. 9000-13,500 ft. — 

 Gore Pass ; sources of Leroux Creek ; continental divide, Routt Co. ; Little 

 Kate Mine, La Plata Mountains ; Cameron Pass ; Mt. Harvard ; Silverton ; 

 Silver Plume ; Rogers ; Bufifalo Pass ; Berthoud Pass ; Caribou ; headwaters 

 of Clear Creek ; Rabbit Ears, Larimer Co. ; Hahn's Peak. 



86. SENECIO L. 



Heads more or less nodding. 



Heads discoid. I. Pudici. 



Heads radiate. 11. Amplectentes. 



Heads not nodding. 

 Heads over 15 mm. high and 20 mm. broad, solitary (seldom 2-3). 



II. Amplectentes. 

 Heads less than 15 mm. high and broad. 

 Plants equally leafy throughout. 



Leaves or their divisions not narrowly linear or filiform. 

 Leaves merely toothed and entire, not pinnatifid. 



Leaf -blades oval, elliptic or obovate, usually obtusish ; heads few. 



III. OCCIDENTALES. 



Leaf -blades triangular or ovate to linear-lanceolate, distinctly acute ; 

 heads usually many. 



